One vertex per element, one color per generator, with an edge from x to x·s.
(2,3)(4,8)(11,13)(15,16)(17,18,20,22)(19,23,24,21)(25,26,30,27)(28,33,35,31)(29,32,38,34)(36,40,37,39)(4,8)(6,7)(9,10,14,12)(11,16,13,15)(19,24)(21,23)(26,27)(28,35)(32,34)(36,37)(1,2,5,3)(4,6,8,7)(9,11,14,13)(10,15,12,16)(17,18)(19,21)(20,22)(23,24)(25,27,30,26)(28,33,35,31)(29,32,38,34)(36,39,37,40)(1,3,5,2)(4,7,8,6)(9,12,14,10)(11,16,13,15)(25,28)(26,31)(27,33)(29,37)(30,35)(32,40)(34,39)(36,38)(1,4,5,8)(2,6,3,7)(9,13,14,11)(10,16,12,15)(17,19,20,24)(18,21,22,23)(25,29)(26,32)(27,34)(28,36)(30,38)(31,39)(33,40)(35,37)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.